You should be able to use Paypal to deposit on
888 if you are in one of these countries: United Kingdom,
ireland,
sweden,
finland, Denmark,
germany, Italy, Spain,
austria,
portugal
If in UK you should be able to deposit on
pokerstars,
party poker, Titan and PKR (Although this last site is shutting down next year).
Outside of these countries you will not be able to deposit directly via Paypal.
Not entirely sure about this but I have also heard that if you are in the US you can deposit with paypal on
wsop (Nevada) and 888 and Party Poker (
New Jersey). You have to be in those states to be able play for real on those sites.
However you can use Paypal to buy or trade for cryptocurrency or you can exchange paypal funds to ewallet funds ewallets like
skrill.
neteller/ecoPayz. You can then use this to deposit on Poker Rooms.